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The viscoelastic anticorrosion coating series includes viscoelastic anticorrosion tape, viscoelastic anticorrosion paste, and polymeric outer protective tape. They are suitable for the anticorrosion of irregular components such as pipeline valves, flanges and tees; the joint coating of pipelines in water networks and tunnels; the repair of anticorrosion coatings and joint coatings for in-service pipelines; and other special fields.
Viscoelastic coating is used to safeguard valves against corrosion. Typically, viscoelastic anticorrosive tape and viscoelastic anticorrosive paste are used together. The specific operation procedure is as follows:
| Item | Test Method | Performance |
|---|---|---|
| Color | Visual estimation | Green |
| Thickness | ISO 21809-3 | ≥1.8 mm |
| Glass transition temperature | ISO 11357-2 | -20 ℃ min |
| Crystallization temperature | ISO 11357-3 | No evidence of crystallization |
| Holiday detection at 5 KV/mm, max. 25 KV | ISO 21809-3 | No holiday |
| Drip resistance | ISO 21809-3 | No dripping |
| Lap shear strength at 23 ℃ | ISO 21809-3 | 0.027 N/mm² |
| Lap shear strength at 70 ℃ | ISO 21809-3 | 0.005 N/mm² |
| Impact resistance | EN 12068 | 15 J |
| Indentation resistance | EN 12068 | 0.6 mm remaining |
| Self healing | ISO 21809-3 | <24 hours @ 23 ℃ |
| Cathodic disbondment resistance at 23 ℃ | ISO 21809-3 | 0 mm | Self healing <24 hours |
| Cathodic disbondment resistance at 70 ℃ | ISO 21809-3 | 0 mm | Self healing <24 hours |
| Electrical resistance | EN 12068 | >10¹⁵ ohm/cm |
| Low temp. flexibility @ -30 ℃ | EN 12068 | No separation, tears or cracks |
